<template>
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="$route.path"
      :collapse="collapse"
      unique-opened
      router
    >
      <template v-for="item in items">
        <template v-if="item.subs">
          <el-submenu :index="item.index" :key="item.index">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.subs">
              <el-submenu
                v-if="subItem.subs"
                :index="subItem.index"
                :key="subItem.index"
              >
                <template slot="title"
                  ><i :class="subItem.icon"></i
                  ><span slot="title">{{ subItem.title }}</span></template
                >
                <el-menu-item
                  v-for="(threeItem, i) in subItem.subs"
                  :key="i"
                  :index="threeItem.index"
                  ><i :class="threeItem.icon"></i
                  ><span slot="title">{{ threeItem.title }}</span></el-menu-item
                >
              </el-submenu>
              <el-menu-item v-else :index="subItem.index" :key="subItem.index"
                ><i :class="subItem.icon"></i
                ><span slot="title">{{ subItem.title }}</span></el-menu-item
              >
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from "@/utils/bus";
export default {
  data() {
    return {
      collapse: false,
      items: [
        {
          icon: "iconfont icon-u-home",
          index: "/dashboard",
          title: "主页"
        },
        {
          icon: "el-icon-menu",
          index: "/resource",
          title: "资源管理",
          subs: [
            {
              icon: "el-icon-s-platform",
              index: "/resource/host",
              title: "主机管理"
            },
            {
              icon: "el-icon-tickets",
              index: "/resource/application",
              title: "系统管理"
            },
            {
              icon: "el-icon-tickets",
              index: "/resource/sqlsummary",
              title: "SQL汇总管理"
            }
          ]
        }
      ]
    };
  },
  created() {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on("collapse", msg => {
      this.collapse = msg;
      bus.$emit("collapse-content", msg);
    });
  }
};
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 50px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 200px;
}
.sidebar > ul {
  height: 100%;
}
.el-menu,
.el-submenu,
.el-menu-item {
  background-color: #f0f8ff;
}

/*.el-submenu,
.el-menu-item > 
span {
    font-size: 13px;
}*/
</style>
